- Search engines
- Optimization practices
- Website traffic
- Site monetization
- Website development
- Professional communication
- SMM
- Exchange and sales
- Financial announcements
- Full-time job
- Buying and selling websites
- Social networks: pages, groups and applications
- Websites without domains
- Traffic, teaser and banner advertising
- Selling, evaluating and registering domains
- Exchanging, buying, selling links
- Programs and scripts
- Posting articles
- Info products
- Other digital goods
- Jobs and services for webmasters
- Optimization, promotion and audit
- Advertising campaigns
- SMM-related services
- Programming
- Server and website administration
- Proxies, VPNs, anonymizers, IPs
- Paid training, webinars
- Registration in directories
- Copywriting, translations
- Design
- Usability: consulting and audit
- Website development
- Filling website with content
- Other services
- Unrelated topics

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In Direct with ad click gives security error
fix it, if you install a free certificate?
What kind of security error? What is written there?
What is your website?
then the certificate is not being. And in general it is not clear what the error? Prevention can?
Yes, everything will be okay, LE normal legitimate certificate.
Here's a page which describes the compatibility of browsers and software https://letsencrypt.org/docs/certificate-compatibility/
Offhand, except some of the exotic and the boundary cases, the popular browsers and software receive a certificate.
I have worked with no errors